Transportation Demand Management (TDM) is one of the tools the City of San Diego employs to improve mobility and reduce congestion, vehicle miles traveled, greenhouse gas emissions and air pollution. The City is committed to improve the integration of the region's transit system and active modes of transportation into new land use developments to facilitate and encourage their use by all those who live and work in the City.

Trolleys and buses are
part of a key TDM strategy.

The San Diego Association of Governments (SANDAG) administers the regional TDM program by marketing and promoting the various benefits of TDM for employers and employees. By promoting TDM measures such as commuter benefits, employers can have a significant effect on the commuting behavior of their employees.